Nitrogen heat capacity ratio

Nitrogen contained in a large tank at a pressure P = 200000 Pa and a temperature of 300 K flows steadily under adiabatic conditions into a second tank through a converging nozzle with a throat diameter of 15 mm. The pressure in the second tank and at the throat of the nozzle is P, = 140000 Pa. Calculate the mass flow rate, M, of nitrogen assuming frictionless flow and ideal gas behaviour. Also calculate the gas speed at the nozzle and establish that the flow is subsonic. The relative molecular mass of nitrogen is 28.02 and the ratio of the specific heat capacities y is 1.39. 

The increase in the temperature ratio comes about because nitrogen and carbon monoxide are only slightly dissociated, even at the 5515°K. temperature, while the water molecule would be more than 19% dissociated at 3120°K., and the hydrogen molecules would also be more than 20% dissociated. The ideal chemical reaction for generation of high temperature, then, is between unstable species to form very stable products (i.e., undissociated) that have a small heat capacity. 

The monomer phase is suspended in the water at about a to i mono-mer/water volume ratio. The reactor is purged with nitrogen and heated to start the reaction. Once underway, temperature control in the reactor is facilitated by the added heat capacity of the water and the low viscosity of the reaction mass—essentially that of the continuous phase—allowing easy heat removal through a jacket. 

---